1. Department of Polymer Engineering, University of Akron, Akron, Ohio 44325, United States
2. Department of Polymer Science, University of Akron, Akron, Ohio 44325, United States
3. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
4. School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
5. Department of Biomedical Engineering, University of Akron, Akron, Ohio 44325, United States
6. Department of Chemistry, Mechanical Engineering and Materials Science, and Orthopaedic Surgery, Duke University, Durham, North Carolina 27708, United States